dom/canvas/CanvasGradient.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #ifndef mozilla_dom_CanvasGradient_h
   6 #define mozilla_dom_CanvasGradient_h
   7
   8 #include "mozilla/Attributes.h"
   9 #include "nsTArray.h"
  10 #include "mozilla/RefPtr.h"
  11 #include "mozilla/dom/CanvasRenderingContext2DBinding.h"
  12 #include "mozilla/dom/CanvasRenderingContext2D.h"
  13 #include "mozilla/gfx/2D.h"
  14 #include "nsWrapperCache.h"
  15 #include "gfxGradientCache.h"
  16
  17 namespace mozilla {
  18 namespace dom {
  19
  20 class CanvasGradient : public nsWrapperCache
  21 {
  22 public:
  23   NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(CanvasGradient)
  24   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(CanvasGradient)
  25
  26   MOZ_BEGIN_NESTED_ENUM_CLASS(Type, uint8_t)
  27     LINEAR = 0,
  28     RADIAL
  29   MOZ_END_NESTED_ENUM_CLASS(Type)
  30
  31   Type GetType()
  32   {
  33     return mType;
  34   }
  35
  36   mozilla::gfx::GradientStops *
  37   GetGradientStopsForTarget(mozilla::gfx::DrawTarget *aRT)
  38   {
  39     if (mStops && mStops->GetBackendType() == aRT->GetBackendType()) {
  40       return mStops;
  41     }
  42
  43     mStops =
  44       gfx::gfxGradientCache::GetOrCreateGradientStops(aRT,
  45                                                       mRawStops,
  46                                                       gfx::ExtendMode::CLAMP);
  47
  48     return mStops;
  49   }
  50
  51   // WebIDL
  52   void AddColorStop(float offset, const nsAString& colorstr, ErrorResult& rv);
  53
  54   JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE
  55   {
  56     return CanvasGradientBinding::Wrap(aCx, this);
  57   }
  58
  59   CanvasRenderingContext2D* GetParentObject()
  60   {
  61     return mContext;
  62   }
  63
  64 protected:
  65   CanvasGradient(CanvasRenderingContext2D* aContext, Type aType)
  66     : mContext(aContext)
  67     , mType(aType)
  68   {
  69     SetIsDOMBinding();
  70   }
  71
  72   nsRefPtr<CanvasRenderingContext2D> mContext;
  73   nsTArray<mozilla::gfx::GradientStop> mRawStops;
  74   mozilla::RefPtr<mozilla::gfx::GradientStops> mStops;
  75   Type mType;
  76   virtual ~CanvasGradient() {}
  77 };
  78
  79 MOZ_FINISH_NESTED_ENUM_CLASS(CanvasGradient::Type)
  80
  81 } // namespace dom
  82 } // namespace mozilla
  83
  84 #endif // mozilla_dom_CanvasGradient_h